On-Construction (New Build) Energy Performance Certificates (OCEPCs)

 

Since SAP calculations are based upon a desk exercise, and not a site survey, it is critical, that the correct information is submitted in order that a calculation can be undertaken. The following is a suggested list of the information sources and data items required.

 

 

1. Information Sources - paper copies of the following

​

2. Site plan to include orientation of the dwelling(s)

​

3. Plans of each storey, normally at 1:50 scale

​

4. Elevations drawings for each elevation

​

5. Section drawing(s) representative of the dwelling

​

6. Written specification describing the construction elements and

    services as per data items below.

 

 

​

Data Items 

 

1. Site address and postcode

​

2. Details of the principal heating and hot water system to include make and model of boiler, details of heating emitters, hot       water cylinder size (if applicable), system controls - Eg: Worcester Bosch Greenstar Junior 28i - to radiators; 140 litre cylinder;   room thermostat + programmer + Thermostatic Radiator Valves (TRVs)

​

3. Details of any secondary heating system present - Eg: a flame effect gas fire to the lounge

​

4. Details of ventilation systems - Eg: Xpelair extract fans to kitchen, bathroom,en-suite and utility

​

5. Details of the internal and external lighting - Eg: 100% low energy fixed internal light fittings

​

6. Details of the construction of all different floors to the property to include type and thicknesses of insulation and any other building products used. Eg: 225mm thick hardcore / 1200g polythene / 125mm concrete slab / 50mm Celotex tuff-R Zero GA30000Z with 25mm perimeter insulation / 500g polythene separating layer / 65mm cement sand screed

​

7. Details of the construction of all different external walls to the property to include type and thicknesses of insulation and other building products used. Eg: 100mm facing brickwork / 50mm clear cavity / 50mm Celotex tuff-R CW3000Z partial fill cavity insulation / 100mm Celcon Standard blockwork inner skin / 13mm 2-coat thistle plaster

​

8. Details of the construction of all different external walls to the property to include type and thicknesses of insulation and other building products used. Eg: 100mm facing brickwork / 50mm clear cavity / 50mm Celotex tuff-R CW3000Z partial fill cavity insulation / 100mm Celcon Standard blockwork inner skin / 13mm 2-coat thistle plaster

​

9. Details of the construction of all different roofs to the property to include type and thicknesses of insulation and other building products used. Eg: 100mm thick Rockwool Rollbatts between ceiling joists crosslaid with 170mm Rockwool Rollbatts.

​

10. Details of the doors and windows to include sizes, type of frame, type of glazing, thickness of glazing, any low emissivity applications. Eg: 4-16-4, air filled, UPVc windows, low E glazing soft coat. Manufacturer's declared 'U' value = 1.6W/m2K.

​

11. Details of any renewable technologies utilised such as Ground Source Heat Pumps, Solar Water Heating, Photovoltaics

​